Multi-proxy reconstructions of paleotemperature in the southern South China Sea since the last deglaciation

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2024-11-07 DOI:10.1016/j.gloplacha.2024.104620

Liping Tian , Yingxue Yang , Li Li, Yanming Ruan, Juan He, Guodong Jia

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Abstract

The accuracy of paleothermometers is a prerequisite for understanding the past sea surface temperature (SST) changes in the tropical seas. Here, we analyzed the SST estimates reconstructed by four lipid proxies with common linear and newly advanced models in parallel in a sediment core collected from the southern South China Sea (SCS). After excluding the impact of terrestrial input, all of the four proxies-inferred SSTs displayed a gradually warming pattern since 18.3 ka. Our long-chain alkenones-derived annual SST at seawater depth of 0–30 m (SST _{0–30 m}) record closely matched the regional synthetic SST record from the entire southern SCS, corresponding to high-latitude climate events during the deglaciation. The temperatures reconstructed by long-chain diols (LCDs) showed an upper limit of 27 °C, and we thus proposed that they reflected the optimal survival temperature for organisms producing LCDs when SST was higher than 27 °C. Isoprenoid and hydroxy glycerol dialkyl glycerol tetraethers (iGDGTs and OH-GDGTs)-derived temperatures likely reflected the subsurface temperature (subT) at seawater depth of 30–125 m and SST towards the warm season in the tropical sea, respectively.

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末次冰期以来南海南部古温度的多代重建

古温度计的准确性是了解热带海洋过去海表温度（SST）变化的先决条件。在此，我们分析了在中国南海南部采集的沉积岩芯中，四种脂质代用指标用普通线性模型和新的先进模型平行重建的海表温度估算值。在排除陆地输入的影响后，四种代用指标推断的海温均显示出自18.3 ka以来逐渐变暖的模式。我们的长链烯酮推导出的海水深度0-30米的年海温（SST 0-30米）记录与整个南中国海南部的区域合成海温记录非常吻合，与脱冰期的高纬度气候事件相对应。长链二元醇（LCDs）重建的温度上限为27 °C，因此我们认为它们反映了当海温高于27 °C时产生长链二元醇的生物的最佳生存温度。异戊二烯和羟基甘油二烷基甘油四醚（iGDGTs和OH-GDGTs）重建的温度可能分别反映了30-125米海水深度的次表层温度（subT）和热带海洋暖季的SST。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.